I just ordered a 4x2x2' with 1/2" glass. The tank maker is going to put a triangular glass rod on the join to increase silicone contact area, so the silicone strip would not be a thin one I suppose. I think it will be in the upwards of 1/2" on each panel, possibly up to 1".
In this case, what colour do you guys think looks better? I went with clear, someone please stop me before it is too late if you think it is not a good idea.